There is a bunch of stuff that is holding value (or moved up) over the last year or two. The problem is that after it rides the $40-50 wave, most of it tends to settle back down into obscurity because the games arn't all that, they just tend to be the only one of that kind available at the time.

Tetris DS (40-50)
POGO Island (+/- 30) This one has dropped down from the 40-50 it pulled for a while
Rain Drops (40)
Backyard Football (+/-30)
Backyard Hockey (+/-20) This one dropped most of its value
Madden 09 (this one has dropped most of its value)
Electroplankton (+/- 50)
Monopoly/Boggle/Yahtzee/Battleship (+/- 40-50)

There are i'm sure a number of others, but i've not been paying attention to the high value DS games, because by the time I've chased down a few of them (Pogo Island for one) their value has dropped back down.


@ GameGuy
Picross is riding the wave thanks to it being OOP and with the recent release of Picross 3D increasing demand. I'd not be surprised to see it get the Orange Bar re-release like Clubhouse Games and Hotel Dusk did.